Electron-electron interactions in graphene bilayers

TL;DR

This paper investigates how electron-electron interactions influence the quasiparticle dispersion in graphene bilayers, revealing a renormalized non-interacting-like behavior consistent with experimental observations.

Contribution

It introduces a four-bands model analysis of electron-electron interactions in graphene bilayers within the Hartree-Fock-Thomas-Fermi framework, highlighting renormalized dispersion parameters.

Findings

Electronic fluid exhibits non-interacting-like dispersion with renormalized parameters.

Results align with recent cyclotron resonance experimental data.

Interactions do not drastically alter the quasiparticle dispersion shape.

Abstract

We study the effect of electron-electron interactions in the quasiparticle dispersion of a graphene bilayer within the Hartree-Fock-Thomas-Fermi theory by using a four-bands model. We find that the electronic fluid can be described by a non-interacting-like dispersion but with renormalized parameters. We compare our results with recent cyclotron resonance experiments in this system.